The White House says President Donald Trump is scheduled to visit a Marine Corps base in Arizona along the U.S.-Mexico border. Trump is set to visit Marine Air Station Yuma on Tuesday afternoon before he travels to Phoenix to hold a rally.

Yuma’s location along the US-Mexico border touches on one of Trump’s signature issues: his call for putting up a border wall to stem illegal immigration from Mexico.

The rally in Phoenix will take place at the city’s convention center. Trump tweeted about the event last week with a link for ticket availability.

The president has been holding campaign-style events in Trump-friendly areas since he took office. The rally will be his first in the West.